Use of Overdrive on a XFX Radeon HD 5770 to improve graphics through 3DTV

I recently purchased an LG2780DM-pz monitor which is quite fantastic for £250 and you can use the RealD glasses from cinemas if you happen to have any, for whatever reason....

To make 3D happen in game the use of TriDef software is a must.
Running films and most singleplayer games in 3D is just fine.
One caveat I must mention about gaming is that you DO NOT need to turn on 3D mode on the TV. It is being controlled on your computer.

However, some games seem to run at sub 30fps when playing multiplayer online... in my case namely Bfbc2.
I run Warhammer 40K:Space Marine at a playable rate online and it is really good.

So I thought, how about I turn up those dials on AMD Overdrive.
Got my 5770 up to 895Mhz (Clock) and 1290Mhz (memory)
Used Kombustor burn in (GL2) with fan on 100% and got a stable temp of 82°C for over 20 minutes and no artifacts
Running the 720 normal preset benchmark I got combined score of something like 3200 (if this means anything to you please do read on)
So I thought this was a reasonable improvement to the running of the gpu and in game it doesn't seem to get much above about 75-77°C

The graphics were noticably smoother when OD was turned on.

I thought to fish for what peoples opinions are for improving graphics are using TriDef.
TriDef isn't crossfire compatible (yet..) so I can't go with that route (seriously contemplated it)

Any ideas?

I've not done any kind of CPU overclock but with 2.8Ghz quad is that really necessary?